Re: Working with string keys in a java.util.Map

[Jamison Hope <jhope@alum.mit.edu>]

In this case, I think another option is to define a wrapper function that
specifies the argument type as String, like:

(define (get attrs key::String) (attrs:get key))

Then (get attrs “owner”) ought to work with the literal converted to
java.lang.String.

-J

On Fri, Jul 3, 2020 at 6:33 PM Per Bothner <per@bothner.com> wrote:

> On 7/3/20 2:52 PM, Sudarshan S Chawathe wrote:
> > I've had to get Java "String"s from Kawa strings often for similar
> > reasons when using other JVM libraries, etc., and I have just used
> > '(String "kawa string)'; it seems to work well, although it does
> > introduce clutter.
>
> I don't see how to avoid that in general.  One could write a wrapper Map
> that uses a coercion function to convert the key to required type,
> similar to the coercion function in the make-parameter function.
>
> Another way is to call the toString method, since Kawa strings
> implement java.lang.CharSequence:
>    ("kstring":toString)
>
> This is cheap if the Kawa string is an IString, since uses a
> java.lang.String.
>
> Alternative syntax:
>
> (->java.lang.String "kstring")
> or shorter:
> (->String "kstring")
> --
>         --Per Bothner
> per@bothner.com   http://per.bothner.com/
>
-- 
Jamison Hope